mirror of https://github.com/go-gorm/gorm.git
138 lines
3.5 KiB
Go
138 lines
3.5 KiB
Go
package gorm
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import (
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"database/sql"
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"fmt"
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"reflect"
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"strings"
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"time"
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)
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type commonDialect struct {
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db *sql.DB
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}
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func init() {
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RegisterDialect("common", &commonDialect{})
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}
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func (commonDialect) GetName() string {
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return "common"
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}
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func (s *commonDialect) SetDB(db *sql.DB) {
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s.db = db
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}
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func (commonDialect) BindVar(i int) string {
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return "$$" // ?
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}
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func (commonDialect) Quote(key string) string {
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return fmt.Sprintf(`"%s"`, key)
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}
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func (commonDialect) DataTypeOf(field *StructField) string {
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var dataValue, sqlType, size, additionalType = ParseFieldStructForDialect(field)
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if sqlType == "" {
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switch dataValue.Kind() {
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case reflect.Bool:
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sqlType = "BOOLEAN"
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uintptr:
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if _, ok := field.TagSettings["AUTO_INCREMENT"]; ok {
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sqlType = "INTEGER AUTO_INCREMENT"
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} else {
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sqlType = "INTEGER"
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}
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case reflect.Int64, reflect.Uint64:
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if _, ok := field.TagSettings["AUTO_INCREMENT"]; ok {
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sqlType = "BIGINT AUTO_INCREMENT"
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} else {
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sqlType = "BIGINT"
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}
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case reflect.Float32, reflect.Float64:
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sqlType = "FLOAT"
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case reflect.String:
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if size > 0 && size < 65532 {
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sqlType = fmt.Sprintf("VARCHAR(%d)", size)
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} else {
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sqlType = "VARCHAR(65532)"
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}
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case reflect.Struct:
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if _, ok := dataValue.Interface().(time.Time); ok {
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sqlType = "TIMESTAMP"
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}
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default:
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if _, ok := dataValue.Interface().([]byte); ok {
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if size > 0 && size < 65532 {
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sqlType = fmt.Sprintf("BINARY(%d)", size)
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} else {
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sqlType = "BINARY(65532)"
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}
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}
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}
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}
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if sqlType == "" {
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panic(fmt.Sprintf("invalid sql type %s (%s) for commonDialect", dataValue.Type().Name(), dataValue.Kind().String()))
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}
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if strings.TrimSpace(additionalType) == "" {
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return sqlType
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}
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return fmt.Sprintf("%v %v", sqlType, additionalType)
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}
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func (s commonDialect) HasIndex(tableName string, indexName string) bool {
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var count int
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s.db.QueryRow("SELECT count(*) FROM INFORMATION_SCHEMA.STATISTICS WHERE table_schema = ? AND table_name = ? AND index_name = ?", s.currentDatabase(), tableName, indexName).Scan(&count)
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return count > 0
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}
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func (s commonDialect) RemoveIndex(tableName string, indexName string) error {
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_, err := s.db.Exec(fmt.Sprintf("DROP INDEX %v", indexName))
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return err
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}
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func (s commonDialect) HasForeignKey(tableName string, foreignKeyName string) bool {
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return false
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}
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func (s commonDialect) HasTable(tableName string) bool {
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var count int
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s.db.QueryRow("SELECT count(*) FROM INFORMATION_SCHEMA.TABLES WHERE table_schema = ? AND table_name = ?", s.currentDatabase(), tableName).Scan(&count)
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return count > 0
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}
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func (s commonDialect) HasColumn(tableName string, columnName string) bool {
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var count int
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s.db.QueryRow("SELECT count(*) FROM INFORMATION_SCHEMA.COLUMNS WHERE table_schema = ? AND table_name = ? AND column_name = ?", s.currentDatabase(), tableName, columnName).Scan(&count)
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return count > 0
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}
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func (s commonDialect) currentDatabase() (name string) {
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s.db.QueryRow("SELECT DATABASE()").Scan(&name)
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return
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}
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func (commonDialect) LimitAndOffsetSQL(limit, offset int) (sql string) {
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if limit > 0 || offset > 0 {
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if limit >= 0 {
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sql += fmt.Sprintf(" LIMIT %d", limit)
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}
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if offset >= 0 {
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sql += fmt.Sprintf(" OFFSET %d", offset)
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}
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}
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return
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}
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func (commonDialect) SelectFromDummyTable() string {
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return ""
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}
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func (commonDialect) LastInsertIDReturningSuffix(tableName, columnName string) string {
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return ""
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}
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